lvws_sensitivity_analysis

Loch Vale Water Chemistry Sensitivity Analysis

What trends exist within the data? Do these trends changed based on sampling frequency?

Examining all post-1995 data for all major ions and parameters using both a linear and general additive model.

Are major ions increasing in concentration in a linear manner over time?

Are there certain months in which said increase is linear?

For which months do we see linear trends?

Nitrate

Biweekly sampling frequency

Sampling once a month

Table of results - nitrate

Month	Sampling Frequency	Slope	p-value	Significance
1	bi-monthly	-0.0048	0.466	N.S.
1	monthly	-0.0063	0.468	N.S.
1	weekly	-0.0083	0.0688	N.S.
2	bi-monthly	-0.0084	0.196	N.S.
2	monthly	-0.0073	0.445	N.S.
2	weekly	-0.0051	0.268	N.S.
3	bi-monthly	-0.0059	0.467	N.S.
3	monthly	-0.0013	0.91	N.S.
3	weekly	-0.0049	0.314	N.S.
4	bi-monthly	-0.0069	0.258	N.S.
4	monthly	-0.0029	0.72	N.S.
4	weekly	-0.0093	0.0315	*
5	bi-monthly	-0.0195	0.0479	*
5	monthly	-0.0123	0.22	N.S.
5	weekly	-0.0248	0.0002	***
6	bi-monthly	-0.0166	0.0053	**
6	monthly	-0.0176	0.0683	N.S.
6	weekly	-0.0165	0	***
7	bi-monthly	-0.0058	0.302	N.S.
7	monthly	-0.0173	0.0304	*
7	weekly	-0.0089	0.0141	*
8	bi-monthly	-0.0208	0.0066	**
8	monthly	-0.0233	0.0427	*
8	weekly	-0.0204	0	***
9	bi-monthly	-0.0271	0.0072	**
9	monthly	-0.0261	0.0903	N.S.
9	weekly	-0.0247	0.0005	***
10	bi-monthly	-0.0265	0.0055	**
10	monthly	-0.0289	0.0234	*
10	weekly	-0.0283	0	***
11	bi-monthly	-0.0188	0.0257	*
11	monthly	-0.0184	0.121	N.S.
11	weekly	-0.0215	0.0003	***
12	bi-monthly	-0.0215	0.0082	**
12	monthly	-0.0183	0.0677	N.S.
12	weekly	-0.0192	0.0004	***

Calcium

Biweekly sampling frequency

Sampling once a month

Table of results - calcium

Month	Sampling Frequency	Slope	p-value	Significance
1	bi-monthly	0.0237	0	***
1	monthly	0.0242	0.0002	***
1	weekly	0.0236	0	***
2	bi-monthly	0.0303	0	***
2	monthly	0.0225	0.0032	**
2	weekly	0.0301	0	***
3	bi-monthly	0.0166	0.0168	*
3	monthly	0.0257	0.0139	*
3	weekly	0.0174	0.0001	***
4	bi-monthly	0.016	0.0337	*
4	monthly	0.0126	0.219	N.S.
4	weekly	0.013	0.007	**
5	bi-monthly	0.0069	0.0741	N.S.
5	monthly	0.0094	0.172	N.S.
5	weekly	0.0099	0.0022	**
6	bi-monthly	0.0005	0.891	N.S.
6	monthly	0.0047	0.371	N.S.
6	weekly	0.0009	0.701	N.S.
7	bi-monthly	0.0049	0.126	N.S.
7	monthly	0.0014	0.756	N.S.
7	weekly	0.0041	0.0486	*
8	bi-monthly	0.0068	0.114	N.S.
8	monthly	0.0041	0.55	N.S.
8	weekly	0.004	0.185	N.S.
9	bi-monthly	0.0077	0.156	N.S.
9	monthly	0.0045	0.524	N.S.
9	weekly	0.0069	0.0651	N.S.
10	bi-monthly	0.0049	0.401	N.S.
10	monthly	0.0078	0.279	N.S.
10	weekly	0.0081	0.0346	*
11	bi-monthly	0.0213	0	***
11	monthly	0.0278	0.001	***
11	weekly	0.0203	0	***
12	bi-monthly	0.0175	0.0003	***
12	monthly	0.0136	0.0425	*
12	weekly	0.0177	0	***

Silica

Biweekly sampling frequency

Sampling once a month

Table of results - silica

Month	Sampling Frequency	Slope	p-value	Significance
1	bi-monthly	-0.0063	0.582	N.S.
1	monthly	0.0083	0.571	N.S.
1	weekly	-0.0026	0.773	N.S.
2	bi-monthly	-0.0068	0.663	N.S.
2	monthly	-0.0043	0.861	N.S.
2	weekly	0.0004	0.971	N.S.
3	bi-monthly	-0.0033	0.878	N.S.
3	monthly	0.0258	0.368	N.S.
3	weekly	0.0023	0.867	N.S.
4	bi-monthly	-0.0133	0.464	N.S.
4	monthly	0.0144	0.589	N.S.
4	weekly	-0.0096	0.473	N.S.
5	bi-monthly	0.0069	0.575	N.S.
5	monthly	-0.0055	0.748	N.S.
5	weekly	0.0058	0.491	N.S.
6	bi-monthly	0.0062	0.461	N.S.
6	monthly	0.0094	0.495	N.S.
6	weekly	0.0048	0.474	N.S.
7	bi-monthly	0.0004	0.955	N.S.
7	monthly	-0.0136	0.108	N.S.
7	weekly	-0.0031	0.43	N.S.
8	bi-monthly	0.001	0.939	N.S.
8	monthly	-0.0156	0.287	N.S.
8	weekly	-0.0008	0.902	N.S.
9	bi-monthly	-0.0103	0.132	N.S.
9	monthly	0.0131	0.471	N.S.
9	weekly	0.0024	0.745	N.S.
10	bi-monthly	-0.0048	0.555	N.S.
10	monthly	-0.0099	0.48	N.S.
10	weekly	-0.0104	0.0569	N.S.
11	bi-monthly	-0.007	0.469	N.S.
11	monthly	-0.0118	0.261	N.S.
11	weekly	-0.0193	0.0075	**
12	bi-monthly	-0.0186	0.106	N.S.
12	monthly	-0.0175	0.311	N.S.
12	weekly	-0.0154	0.03	*

Temperature

Biweekly sampling frequency

Sampling once a month

Table of results - Temperature

Month	Sampling Frequency	Slope	p-value	Significance
1	bi-monthly	0.0137	0.0854	N.S.
1	monthly	0.0136	0.224	N.S.
1	weekly	0.0164	0.0045	**
2	bi-monthly	0.0083	0.207	N.S.
2	monthly	0.0186	0.0813	N.S.
2	weekly	0.0121	0.0131	*
3	bi-monthly	0.039	0.0454	*
3	monthly	0.0293	0.325	N.S.
3	weekly	0.0328	0.0021	**
4	bi-monthly	0.0364	0.162	N.S.
4	monthly	0.0596	0.0397	*
4	weekly	0.0519	0.0024	**
5	bi-monthly	0.0481	0.296	N.S.
5	monthly	0.0062	0.932	N.S.
5	weekly	0.0098	0.754	N.S.
6	bi-monthly	-0.0288	0.559	N.S.
6	monthly	-0.0179	0.774	N.S.
6	weekly	-0.0055	0.865	N.S.
7	bi-monthly	0.0066	0.87	N.S.
7	monthly	0.0807	0.164	N.S.
7	weekly	0.0283	0.275	N.S.
8	bi-monthly	0.0484	0.145	N.S.
8	monthly	0.06	0.192	N.S.
8	weekly	0.05	0.0202	*
9	bi-monthly	0.0293	0.491	N.S.
9	monthly	0.09	0.217	N.S.
9	weekly	0.0266	0.437	N.S.
10	bi-monthly	-0.0068	0.868	N.S.
10	monthly	-0.033	0.573	N.S.
10	weekly	-0.0043	0.885	N.S.
11	bi-monthly	0.0279	0.117	N.S.
11	monthly	0.0353	0.215	N.S.
11	weekly	0.0306	0.0078	**
12	bi-monthly	0.0129	0.123	N.S.
12	monthly	0.0133	0.31	N.S.
12	weekly	0.0067	0.224	N.S.

ANC

Biweekly sampling frequency

Sampling once a month

Conductivity (field)

Biweekly sampling frequency

Sampling once a month

Conductivity (lab)

Biweekly sampling frequency

Sampling once a month

pH (field)

Biweekly sampling frequency

Sampling once a month

pH (lab)

Biweekly sampling frequency

Sampling once a month

Magnesium

Biweekly sampling frequency

Sampling once a month

Table of results - magnesium

Month	Sampling Frequency	Slope	p-value	Significance
1	bi-monthly	0.0029	0	***
1	monthly	0.0028	0.0025	**
1	weekly	0.0022	0.0018	**
2	bi-monthly	0.0038	0	***
2	monthly	0.0026	0.0298	*
2	weekly	0.0037	0	***
3	bi-monthly	0.0013	0.213	N.S.
3	monthly	0.0026	0.0697	N.S.
3	weekly	0.0016	0.0187	*
4	bi-monthly	0.0013	0.234	N.S.
4	monthly	0.0008	0.554	N.S.
4	weekly	0.0015	0.0318	*
5	bi-monthly	0.0006	0.395	N.S.
5	monthly	0.001	0.368	N.S.
5	weekly	0.001	0.0719	N.S.
6	bi-monthly	0.0009	0.257	N.S.
6	monthly	0.0013	0.309	N.S.
6	weekly	0.0006	0.277	N.S.
7	bi-monthly	0.0024	0.0022	**
7	monthly	0.0014	0.0611	N.S.
7	weekly	0.002	0	***
8	bi-monthly	0.0024	0.0012	**
8	monthly	0.0019	0.109	N.S.
8	weekly	0.0018	0.0004	***
9	bi-monthly	0.0023	0.0079	**
9	monthly	0.002	0.0955	N.S.
9	weekly	0.002	0.0015	**
10	bi-monthly	0.0032	0.0018	**
10	monthly	0.004	0.007	**
10	weekly	0.0038	0	***
11	bi-monthly	0.0052	0	***
11	monthly	0.0062	0.0002	***
11	weekly	0.0045	0	***
12	bi-monthly	0.0024	0.0025	**
12	monthly	0.002	0.065	N.S.
12	weekly	0.0025	0	***

Sulfate

Biweekly sampling frequency

Sampling once a month

Table of results - sulfate

Month	Sampling Frequency	Slope	p-value	Significance
1	bi-monthly	0.0745	0	***
1	monthly	0.0739	0.0001	***
1	weekly	0.0684	0	***
2	bi-monthly	0.0576	0	***
2	monthly	0.0592	0.0008	***
2	weekly	0.0583	0	***
3	bi-monthly	0.049	0	***
3	monthly	0.05	0.0025	**
3	weekly	0.0473	0	***
4	bi-monthly	0.0368	0.0002	***
4	monthly	0.0491	0.0005	***
4	weekly	0.0347	0	***
5	bi-monthly	0.0094	0.105	N.S.
5	monthly	0.0119	0.177	N.S.
5	weekly	0.0102	0.015	*
6	bi-monthly	0.0021	0.658	N.S.
6	monthly	0.0039	0.599	N.S.
6	weekly	0.0029	0.43	N.S.
7	bi-monthly	0.0181	0.0014	**
7	monthly	0.0126	0.0557	N.S.
7	weekly	0.0155	0	***
8	bi-monthly	0.0176	0.0083	**
8	monthly	0.0152	0.127	N.S.
8	weekly	0.0162	0.0005	***
9	bi-monthly	0.0288	0.0033	**
9	monthly	0.0208	0.151	N.S.
9	weekly	0.0255	0.0002	***
10	bi-monthly	0.0459	0	***
10	monthly	0.0447	0.0069	**
10	weekly	0.042	0	***
11	bi-monthly	0.066	0	***
11	monthly	0.0678	0.0001	***
11	weekly	0.0625	0	***
12	bi-monthly	0.0623	0.0001	***
12	monthly	0.0567	0.0011	**
12	weekly	0.0634	0	***

Chlorine

Biweekly sampling frequency

Sampling once a month

Table of results - chlorine

Month	Sampling Frequency	Slope	p-value	Significance
1	bi-monthly	0.0041	0	***
1	monthly	0.0044	0.0018	**
1	weekly	0.0037	0	***
2	bi-monthly	0.0029	0.0158	*
2	monthly	0.0032	0.185	N.S.
2	weekly	0.0037	0.233	N.S.
3	bi-monthly	0.0014	0.377	N.S.
3	monthly	0.0012	0.652	N.S.
3	weekly	0.0024	0.0229	*
4	bi-monthly	0.0025	0.408	N.S.
4	monthly	0.0034	0.562	N.S.
4	weekly	0.0016	0.313	N.S.
5	bi-monthly	0.0027	0.0757	N.S.
5	monthly	0.0026	0.291	N.S.
5	weekly	0.0024	0.0053	**
6	bi-monthly	0.0015	0.31	N.S.
6	monthly	0.0018	0.431	N.S.
6	weekly	0.0016	0.0617	N.S.
7	bi-monthly	0.0014	0.085	N.S.
7	monthly	0.0015	0.2	N.S.
7	weekly	0.0011	0.24	N.S.
8	bi-monthly	0.0035	0.142	N.S.
8	monthly	0.0002	0.9	N.S.
8	weekly	0.0019	0.104	N.S.
9	bi-monthly	0.0004	0.719	N.S.
9	monthly	-0.0029	0.355	N.S.
9	weekly	-0.0004	0.709	N.S.
10	bi-monthly	0.0025	0.0384	*
10	monthly	0.0023	0.128	N.S.
10	weekly	0.0023	0.0041	**
11	bi-monthly	0.0035	0.0007	***
11	monthly	0.0031	0.019	*
11	weekly	0.0032	0	***
12	bi-monthly	0.0032	0.0008	***
12	monthly	0.0017	0.168	N.S.
12	weekly	0.0025	0	***

DOC

Biweekly sampling frequency

Sampling once a month

Table of results - DOC

Month	Sampling Frequency	Slope	p-value	Significance
1	bi-monthly	-0.0053	0.2	N.S.
1	monthly	-0.0056	0.349	N.S.
1	weekly	-0.0061	0.0922	N.S.
2	bi-monthly	-0.0151	0.0049	**
2	monthly	-0.0074	0.527	N.S.
2	weekly	-0.0106	0.0136	*
3	bi-monthly	-0.0085	0.227	N.S.
3	monthly	-0.0157	0.184	N.S.
3	weekly	-0.012	0.0144	*
4	bi-monthly	0.005	0.771	N.S.
4	monthly	0.0048	0.858	N.S.
4	weekly	-0.0055	0.643	N.S.
5	bi-monthly	-0.0185	0.232	N.S.
5	monthly	-0.0233	0.271	N.S.
5	weekly	-0.0129	0.236	N.S.
6	bi-monthly	0.0146	0.347	N.S.
6	monthly	0.0132	0.542	N.S.
6	weekly	0.0026	0.791	N.S.
7	bi-monthly	0.0094	0.072	N.S.
7	monthly	-0.0015	0.838	N.S.
7	weekly	0.0072	0.0317	*
8	bi-monthly	-0.001	0.846	N.S.
8	monthly	0.0022	0.639	N.S.
8	weekly	-0.0035	0.266	N.S.
9	bi-monthly	-0.006	0.254	N.S.
9	monthly	-0.0011	0.91	N.S.
9	weekly	-0.0031	0.425	N.S.
10	bi-monthly	0.0087	0.0655	N.S.
10	monthly	0.0086	0.216	N.S.
10	weekly	0.0066	0.0616	N.S.
11	bi-monthly	0.0018	0.811	N.S.
11	monthly	-0.001	0.91	N.S.
11	weekly	0.0055	0.206	N.S.
12	bi-monthly	0.0006	0.919	N.S.
12	monthly	-0.0018	0.83	N.S.
12	weekly	0.0019	0.623	N.S.

TDN

Biweekly sampling frequency

Sampling once a month

Ammonium

Biweekly sampling frequency

Sampling once a month

Table of results - ammonium

Month	Sampling Frequency	Slope	p-value	Significance
1	bi-monthly	0.0003	0.407	N.S.
1	monthly	0.0001	0.913	N.S.
1	weekly	0.0004	0.236	N.S.
2	bi-monthly	-0.0001	0.901	N.S.
2	monthly	0.0005	0.496	N.S.
2	weekly	0.0002	0.682	N.S.
3	bi-monthly	0.0007	0.198	N.S.
3	monthly	0.001	0.276	N.S.
3	weekly	0.0006	0.0945	N.S.
4	bi-monthly	-0.0001	0.929	N.S.
4	monthly	-0.0005	0.441	N.S.
4	weekly	-0.0002	0.625	N.S.
5	bi-monthly	0.0004	0.62	N.S.
5	monthly	0.0002	0.836	N.S.
5	weekly	0.0002	0.708	N.S.
6	bi-monthly	0.0002	0.814	N.S.
6	monthly	-0.0017	0.306	N.S.
6	weekly	-0.0002	0.674	N.S.
7	bi-monthly	-0.0007	0.288	N.S.
7	monthly	0.0001	0.897	N.S.
7	weekly	-0.0006	0.243	N.S.
8	bi-monthly	-0.0002	0.688	N.S.
8	monthly	-0.0003	0.675	N.S.
8	weekly	0	0.901	N.S.
9	bi-monthly	0.0004	0.499	N.S.
9	monthly	0.0003	0.658	N.S.
9	weekly	0.0001	0.703	N.S.
10	bi-monthly	0	0.988	N.S.
10	monthly	0.0011	0.193	N.S.
10	weekly	0.0006	0.237	N.S.
11	bi-monthly	-0.0007	0.219	N.S.
11	monthly	-0.0012	0.193	N.S.
11	weekly	-0.0009	0.037	*
12	bi-monthly	0.0005	0.323	N.S.
12	monthly	0.0004	0.557	N.S.
12	weekly	0.0003	0.33	N.S.

TIN

Biweekly sampling frequency

Sampling once a month

DON

Biweekly sampling frequency

Sampling once a month